engine cylinder is of the order of (a) 500- 1000°C (b) 1000- 1500°C (c) 1500-2000°C (d) 2000-2500°C (e) 2500-3000°C Ans: d 23. engines usuall occurs as (a) first a mild explosion followed by a bi explosion (b) first a big explosion followed by a mil explosion (c) both mild and big explosions occi simultaneously (d) never occurs (e) unpredictable. engine are usually based on (a) low heat value of oil (b) high heat value of oil (c) net calorific value of oil (d) calorific value of fuel (e) all of the above. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be (a) 2% (b) 4% (c) 8% (d) 14% (e) 27%. In case of gas turbines, the gaseous fuel consumption guarantees are based on (a) high heat value (b) low heat value (c) net calorific value (d) middle heat value (e) calorific value. In a typical medium speed 4-stroke cycle diesel engine the inlet valve (a) opens at 20° before top dead center and closes at 35° after the bottom dead center (b) opens at top dead center and closes at bottom dead center (c) opens at 10° after top dead center and closes 20° before the bottom dead center (d) may open or close anywhere (e) remains open for 200°. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of (a) 4 – 6 kg/cm2 and 200 – 250°C (b) 6 – 12 kg/cm2 and 250 – 350°C (c) 12 – 20 kg/cm2 and 350 – 450°C (d) 20 – 30 kg/cm2 and 450 – 500°C (e) 30 – 40 kg/cm2 and 500 – 700°C. The pressure at the end of compression in the case of diesel engine is of the order of (a) 6 kg/cm (b) 12kg/cmz (c) 20 kg/cmz (d) 27.5 kg/cmz (e) 35 kg/cm Ans: e 22. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will (a) increase (b) decrease (c) be independent (d) may increase or decrease depending on other factors (e) none of the above. Pick up the wrong statement (a) 2-stroke engine can run in any direction (b) In 4-stroke engine, a power stroke is obtained in 4-strokes (c) thermal efficiency of 4-stroke engine is more due to positive scavenging (d) petrol engines work on otto cycle (e) petrol engines occupy more space than diesel engines for same power output. Combustion in compression ignition engines is (a) homogeneous (b) heterogeneous (c) both (a) and (b) (d) laminar (e) turbulent. The fuel in diesel engine is normally injected at pressure of (a) 5-10 kg/cm2 (b) 20-25 kg/cm2 (c) 60-80 kg/cm2 (d) 90-130 kg/cm2 (e) 150-250 kg/cm2 Ans: d 27.

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I have attempted to determine if there is a particular type of food, or food additive that might trigger the symptoms, and have noticed the symptoms always occur when I eat peanut butter or the snack crackers that are sold in vending machines, and will occassionally happen when I eat homemade macroni and cheese. Note: I am borderline hypertensive and take 20mg of lisinopril a day.